TWI447512B - Projection device and light source device thereof - Google Patents

Description

Projection device and light source device thereof

The present invention relates to a developing device, and more particularly to a projection device.

In order to reduce the size of a small projector using a light emitting diode (LED), a small projector usually uses fly eyes as one of optical elements. However, when the light intensity (Etendue) reflected by the digital micro device (DMD) into the lens is smaller than that of the light-emitting diode, the light that enters the fly-eye lens after passing through the collimator will not be The fly-eye lens is completely delivered, which in turn wastes a lot of energy.

It can be seen that the above existing methods obviously still have inconveniences and defects, and need to be further improved. In order to solve the above problems, the relevant fields have not exhausted their efforts to seek solutions, but the methods that have not been applied for a long time have been developed. Therefore, how to avoid the problem that the light generated by the light-emitting diode can not be effectively utilized, thereby causing energy waste, is one of the current important research and development topics, and has become an urgent target for improvement in related fields.

It is an object of the present invention to provide a light source device for improving the light generated by the light-emitting diodes from being effectively utilized, thereby causing waste of energy.

In order to achieve the above object, a technical aspect of the present invention relates to a light source device. The light source device includes at least one light emitting diode, at least one dichroic mirror, a light collector, and a fly-eye lens. The light emitting diode is used to generate at least one light. The dichroic mirror is disposed opposite the light emitting diode such that when the light passes through the dichroic mirror, the dichroic mirror combines the light in the same optical path. The concentrator is disposed opposite the dichroic mirror to concentrate the light by the concentrator when the light passes through the concentrator. The fly-eye lens is disposed opposite the concentrator such that when the light passes through the fly-eye lens, the light is homogenized by the fly-eye lens.

According to an embodiment of the invention, the fly-eye lens comprises a plurality of lenslets. When the light passes through the aforementioned small lenses, a plurality of images are generated.

According to another embodiment of the present invention, the light source device further includes a concave lens and a concentrator set. When the concave lens is disposed opposite to the fly-eye lens such that the images pass through the concave lens, the image is superimposed on the digital micromirror device by the concave lens. The concentrator group is disposed opposite to the concave lens, and the concentrator group includes a first concentrator and a second concentrator, and the first concentrator and the second concentrator are configured to control an angular magnification of the light source device.

According to still another embodiment of the present invention, the light source device further includes a digital micromirror device and a trans internal total reflection 稜鏡. The digital micromirror device is arranged opposite the fly eye lens. The trans internal total reflection 稜鏡 is disposed in front of the digital micromirror device in the same optical path, so that when the light passes through the trans internal total reflection ,, the trans internal total reflection 稜鏡 projects the light onto the digital micromirror device. It is controlled by the digital micromirror device to cause the light to be incident on the trans internal total reflection 稜鏡 again and projected onto the screen via the lens.

According to still another embodiment of the present invention, the light source device further includes at least one collimating mirror. The collimating mirrors are arranged in front of the dichroic mirror in the same optical path so that when the light passes through the collimating mirror, the collimating mirror parallelizes the light.

According to still another embodiment of the present invention, the light emitting diode comprises a red light emitting diode, green Light-emitting diodes and blue light-emitting diodes. The red light emitting diode, the green light emitting diode, and the blue light emitting diode are respectively used to generate red light, green light, and blue light.

To achieve the above object, one aspect of the present invention relates to a projection apparatus. The projection device comprises at least one light emitting diode, at least one collimating mirror, at least one dichroic mirror, a concentrator, a fly-eye lens, a digital micromirror device, and a trans internal total reflection 稜鏡. The light emitting diode is used to generate at least one light. The collimating mirror is disposed opposite the light emitting diode such that when the light passes through the collimating mirror, the light is collimated by the collimating mirror. The dichroic mirror is arranged opposite the collimating mirror so that when the light passes through the dichroic mirror, the dichroic mirror combines the light in the same optical path.

In addition, the concentrator and the dichroic mirror are arranged opposite to each other such that when the light passes through the concentrator, the light is collected by the concentrator. The fly-eye lens is disposed opposite the concentrator such that when the light passes through the fly-eye lens, the light is homogenized by the fly-eye lens. The digital micromirror device is arranged opposite the fly eye lens. The trans internal total reflection 稜鏡 is disposed in front of the digital micromirror device in the same optical path, so that when the light passes through the trans internal total reflection ,, the trans internal total reflection 稜鏡 projects the light onto the digital micromirror device. It is controlled by the digital micromirror device to cause the light to be incident on the trans internal total reflection 稜鏡 again and projected onto the screen via the lens.

According to an embodiment of the invention, the fly-eye lens comprises a plurality of lenslets. When the light passes through the aforementioned small lenses, a plurality of images are generated.

According to another embodiment of the present invention, the projection apparatus further includes a concave lens and a concentrator set. When the concave lens is disposed opposite to the fly-eye lens such that the images pass through the concave lens, the image is superimposed on the digital micromirror device by the concave lens. The concentrator group is disposed opposite to the concave lens, and the concentrator group includes a first concentrator and a second concentrator, and the first concentrator and the second concentrator are configured to control an angular magnification of the projection device.

According to still another embodiment of the present invention, the light emitting diode includes a red light emitting diode, a green light emitting diode, and a blue light emitting diode. The red light emitting diode, the green light emitting diode, and the blue light emitting diode are respectively used to generate red light, green light, and blue light.

Therefore, according to the technical content of the present invention, an embodiment of the present invention provides a light source device or a projection device, thereby improving the problem that light generated by the light-emitting diode cannot be effectively utilized, thereby causing waste of energy.

110‧‧‧Future eye lens

120‧‧‧Fourier lens

130‧‧‧Digital micromirror device

200‧‧‧Light source device

210‧‧‧Lighting diode

212‧‧‧Red LEDs

214‧‧‧Green LED

216‧‧‧Blue LED

220‧‧‧ collimation mirror

222‧‧‧First collimating mirror

224‧‧‧Second collimating mirror

226‧‧‧3rd collimating mirror

230‧‧‧ dichroic mirror

240‧‧‧ concentrator

250‧‧‧Future eye lens

260‧‧‧ concave lens

270‧‧‧ concentrator group

272‧‧‧First light collector

274‧‧‧Second light collector

280‧‧‧Trans internal total reflection稜鏡

290‧‧‧Digital Micromirror Device

300‧‧‧Projection device

310‧‧‧Lighting diode

312‧‧‧Red LED

314‧‧‧Green LED

316‧‧‧Blue LED

320‧‧‧ collimation mirror

322‧‧‧First collimating mirror

324‧‧‧Second collimating mirror

326‧‧‧3rd collimating mirror

330‧‧‧ dichroic mirror

340‧‧‧ concentrator

350‧‧‧Future eye lens

360‧‧‧ concave lens

370‧‧‧Light collector group

372‧‧‧First light collector

374‧‧‧Second light collector

380‧‧‧Trans internal total reflection稜鏡

390‧‧‧Digital Micromirror Device

H001‧‧ lens

I001‧‧‧Reflection mirror

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. Schematic diagram.

2 is a schematic view showing a light source device according to another embodiment of the present invention.

FIG. 3 is a schematic view showing a projection apparatus according to still another embodiment of the present invention.

In order to make the description of the present disclosure more complete and complete, reference is made to the accompanying drawings and the accompanying drawings. However, the embodiments provided are not intended to limit the scope of the invention, and the description of the operation of the structure is not intended to limit the order of its execution, and any device that is recombined by the components produces equal devices. The scope covered by the invention.

The drawings are for illustrative purposes only and are not drawn to the original dimensions. On the other hand, well-known elements and steps are not described in the embodiments to avoid unnecessarily limiting the invention.

1 is a view showing an optical element of a light source device according to an embodiment of the invention. Schematic diagram.

As shown in FIG. 1, the focal length of the fly-eye lens 110 is f, a Fourier lens 120 is disposed at a distance D, and the focal length is F, and the light passing through the fly-eye lens 110 is imaged at the digital micromirror device 130. Further, it is assumed that the cone angle of the light range x1 incident on the fly-eye lens 110 is α 1, the cone angle of the light range x2 on the digital micromirror device 130 is α 2 , and the distance between the fly-eye lenses 110 is p.

Then there are the following relations: Can be organized into:

When D=F, the optical element can make the light projected on the digital micromirror device 130 a telecentric, therefore, -1/F(α 1f-np)=α 2=the maximum value of the flip angle of the digital micromirror device . When α 1 ≧ p / 2f, R / F ≒ α 2 = the maximum value of the flip angle of the digital micromirror device (R is the light range of the incident fly-eye lens 110). This shows that In order to reduce the size of the optical component, the smaller the F is, that is, the R needs to be reduced. The LED light is acted upon by the collimating mirror to make the three-color light pass through the dichroic mirror with high reflectivity, but α 1 is too small (<p/2f), so the inventive embodiment applies the concentrator to converge the range of light so that R is approximately equal to When the width of the digital micromirror device is made, α 1≧p/2f is optimized for volume and light efficiency.

FIG. 2 is a schematic diagram of a light source device 200 according to another embodiment of the invention. The light source device 200 includes at least one light emitting diode 210, at least one dichroic mirror 230, a light collector 240, and a fly eye lens 250. The light emitting diode 210 is used to generate at least one light. The dichroic mirror 230 is disposed opposite to the light emitting diode 210 such that when the light passes through the dichroic mirror 230, the dichroic mirror 230 combines the light rays in the same optical path. The concentrator 240 is disposed opposite the dichroic mirror 230 to illuminate the light by the concentrator 240 as it passes through the concentrator 240. When the fly-eye lens 250 is disposed opposite to the dichroic mirror 230 so that light passes through the fly-eye lens 250, the light is uniformized by the fly-eye lens 250.

As described above, the embodiment of the present invention uses the concentrator 240 to concentrate the light, so that when the light is concentrated, the range of light incident on the fly-eye lens 250 is relatively reduced, so that the size of the fly-eye lens 250 can be reduced, thereby making the light source The device 200 is miniaturized.

In one embodiment, the fly-eye lens 250 includes a plurality of lenslets (as shown by the fly-eye lens 110 of FIG. 1). When the light passes through the aforementioned small lenses, a plurality of images are generated.

Further, the light source device 200 may further include a concave lens 260 and a light collector group 270. When the concave lens 260 is disposed opposite to the fly-eye lens 250 so that the aforementioned images pass through the concave lens 260, the image is superimposed on the digital micromirror device 290 by the concave lens 260. The concentrator group 270 is disposed opposite to the concave lens 260. The concentrator group 270 includes a first concentrator 272 and a second concentrator 274. The first concentrator 272 and the second concentrator 274 are configured to control the light source device. Angular magnification of 200.

In another embodiment, the light source device 200 may further include a digital micromirror device 290 and a trans internal total reflection 280. The digital micromirror device 290 is disposed opposite the fly eye lens 250. The trans internal total reflection 稜鏡 280 is disposed in front of the digital micromirror device 290 in the same optical path so that the light passes through the trans internal total reflection 稜鏡 280, and the trans internal total reflection 稜鏡 280 projects the light in the digital micro The mirror device 290 is controlled by the digital micromirror device 290 to cause the light to be again incident on the trans internal total reflection 稜鏡280 and projected onto the screen (not shown) via the lens H001.

As described above, in the embodiment of the present invention, the light range of the incident fly-eye lens 250 can be adjusted by the concentrator 240 so that the light range of the incident fly-eye lens 250 is approximately equal to the width of the digital micro-mirror device 290, and the efficiency of the light can be made at this time. Optimized.

In still another embodiment, the light source device 200 may further include at least one collimating mirror 220. The collimating mirror 220 is disposed in front of the dichroic mirror 230 in the same optical path so that when the light passes through the collimating mirror 220, the collimating mirror 220 parallelizes the light.

For example, the light emitting diode 210 in the light source device 200 includes a red light emitting diode 212, a green light emitting diode 214, and a blue light emitting diode 216. The collimating mirror 220 includes a first collimating mirror 222, The second collimating mirror 224 and the third collimating mirror 226. The red light emitting diode 212, the green light emitting diode 214, and the blue light emitting diode 216 are respectively used to generate red light, green light, and blue light, and are respectively composed of a first collimating mirror 222, a second collimating mirror 224, and The third collimating mirror 226 parallelizes red, green, and blue light. Next, red, green, and blue light are combined by the dichroic mirror 230 in the same optical path.

FIG. 3 is a schematic view showing a projection device 300 and its ray travel according to another embodiment of the invention.

Referring to FIG. 3, the projection device 300 includes at least one light emitting diode 310, at least one The collimating mirror 320, the at least one dichroic mirror 330, the concentrator 340, the fly-eye lens 350, the digital micromirror device 390, and the trans internal total reflection 稜鏡 380. The light emitting diode 310 is used to generate at least one light. The collimating mirror 320 is disposed opposite the light emitting diode 310 such that when the light passes through the collimating mirror 320, the collimating lens 320 parallelizes the light. The dichroic mirror 330 is disposed opposite to the collimating mirror 320 such that when the light passes through the dichroic mirror 330, the dichroic mirror 330 combines the light rays in the same optical path.

For example, the light emitting diode 310 in the projection device 300 includes a red light emitting diode 312, a green light emitting diode 314, and a blue light emitting diode 316. The collimating mirror 320 includes a first collimating mirror 322, The second collimating mirror 324 and the third collimating mirror 326. The red light emitting diode 312, the green light emitting diode 314, and the blue light emitting diode 316 are respectively used to generate red light, green light, and blue light, and are respectively composed of a first collimating mirror 322, a second collimating mirror 324, and The third collimating mirror 326 parallelizes red, green, and blue light. Next, red, green, and blue light are combined by the dichroic mirror 330 in the same optical path.

Further, the concentrator 340 is disposed opposite to the dichroic mirror 330 such that when the light passes through the concentrator 340, the light is collected by the concentrator 340. In the same optical path, the light collected by the concentrator 340 is reflected by the reflecting mirror I001 to the fly-eye lens 350. The fly-eye lens 350 is disposed opposite the concentrator 340 such that when the light passes through the fly-eye lens 350, the light is homogenized by the fly-eye lens 350.

As described above, the embodiment of the present invention uses the concentrator 340 to concentrate the light, so that when the light is concentrated, the range of light incident on the fly-eye lens 350 is relatively reduced, so that the size of the fly-eye lens 350 can be reduced, thereby making the projection. The device 300 is miniaturized.

Furthermore, the digital micromirror device 390 is disposed opposite the fly eye lens 350. The trans internal total reflection 稜鏡 380 is disposed opposite to the digital micromirror device 390 in the same optical path, so that When the light passes through the trans internal total reflection 稜鏡 380, the trans internal total reflection 稜鏡 380 projects the light onto the digital micromirror device 390, which is controlled by the digital micromirror device 390 to cause the light to re-enter the trans internal total reflection. 380, and projected onto the screen (not shown) via the lens H001.

As described above, in the embodiment of the present invention, the light range of the incident fly-eye lens 350 can be adjusted by the concentrator 340 so that the light range of the incident fly-eye lens 350 is approximately equal to the width of the digital micro-mirror device 390, and the efficiency of the light can be made at this time. Optimized.

In one embodiment, the fly-eye lens 350 includes a plurality of lenslets that produce a plurality of images as the light passes through the lenslets.

In an optional embodiment, the projection device 300 further includes a concave lens 360 and a concentrator assembly 370. The concave lens 360 and the concentrator assembly 370 are disposed between the fly-eye lens 350 and the digital micromirror device 390 on the same optical path. The light is subjected to spectroscopic processing, and the processing method is as follows: when the concave lens 360 and the fly-eye lens 350 are disposed opposite to each other such that the images pass through the concave lens 360, the image is superimposed on the digital micromirror device 390 by the concave lens 360. The concentrator group 370 is disposed opposite to the concave lens 360. The concentrator group 370 includes a first concentrator 372 and a second concentrator 374. The first concentrator 372 and the second concentrator 374 are configured to control the projection device. Angular magnification of 300.

It will be apparent from the above-described embodiments of the present invention that the application of the present invention has the following advantages. In the embodiment of the present invention, by providing a light source device 200 or a projection device 300, the light range of the incident fly-eye lenses 250, 350 can be adjusted by the light collectors 240, 340, so that the light range of the incident fly-eye lenses 250, 350 is approximately equal to the digital position. The width of the micromirror devices 290, 390 can optimize the efficiency of the light at this time, thereby improving the light generated by the light-emitting diodes and making them useless, thereby causing waste of energy.

In addition, the embodiment of the present invention uses the concentrators 240, 340 to concentrate the light, so that when the light is concentrated, the range of light incident on the fly-eye lenses 250, 350 is relatively reduced, thereby reducing the size of the fly-eye lenses 250, 350. Further, the light source device 200 or the projection device 300 is miniaturized.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

200‧‧‧Light source device

210‧‧‧Lighting diode

212‧‧‧Red LEDs

214‧‧‧Green LED

216‧‧‧Blue LED

220‧‧‧ collimation mirror

222‧‧‧First collimating mirror

224‧‧‧Second collimating mirror

226‧‧‧3rd collimating mirror

230‧‧‧ dichroic mirror

240‧‧‧ concentrator

250‧‧‧Future eye lens

260‧‧‧ concave lens

270‧‧‧ concentrator group

272‧‧‧First light collector

274‧‧‧Second light collector

280‧‧‧Reverse TIR Prism

290‧‧‧Digital Micromirror Device

H001‧‧ lens

I001‧‧‧Reflection mirror

Claims (10)

A light source device comprising: at least one light emitting diode for generating at least one light; at least one dichroic mirror disposed opposite to the light emitting diode, wherein the light is passed through the dichroic mirror Combining the light in the same optical path; a concentrator disposed opposite the dichroic mirror such that the light passes through the concentrator, the light is concentrated by the concentrator; and a fly-eye lens, and the concentrating light The light is homogenized by the fly-eye lens when the light is passed through the fly-eye lens. The light source device of claim 1, wherein the fly-eye lens comprises: a plurality of lenslets that generate a plurality of images as the light passes through the lenslets. The light source device of claim 2, further comprising: a concave lens disposed opposite to the fly-eye lens such that the image is superimposed on the digital micromirror device by the concave lens; and an episode An optical device group is disposed opposite to the concave lens, the concentrator group includes a first concentrator and a second concentrator, and the first concentrator and the second concentrator are configured to control the light source device The angular magnification. The light source device of claim 1, further comprising: a digital micromirror device disposed opposite to the fly-eye lens; and a trans internal total reflection 稜鏡 disposed opposite the digital micromirror device in the same optical path When the light passes through the trans internal total reflection ,, the trans internal total reflection 投射 projects the ray onto the digital micromirror device, and the digital micromirror is mounted The control is set such that the light is again incident on the trans internal total reflection pupil and projected onto a screen via a lens. The light source device of claim 1, further comprising: at least one collimating mirror, which is disposed in front of the dichroic mirror in the same optical path, so that the light passes through the collimating mirror, and the collimating mirror The light is parallelized. The light source device of claim 1, wherein the light emitting diode comprises: a red light emitting diode, a green light emitting diode, and a blue light emitting diode for respectively generating a red light and a green color. Light and a blue light. A projection device comprising: at least one light emitting diode for generating at least one light; at least one collimating mirror disposed opposite to the light emitting diode to pass the light through the collimating mirror Parallelizing the light; at least one dichroic mirror disposed opposite the collimating mirror such that the light passes through the dichroic mirror, and the dichroic mirror combines the light in the same optical path; a concentrator, and the The dichroic mirror is oppositely disposed such that when the light passes through the concentrator, the light is concentrated by the concentrator; and a fly-eye lens is disposed opposite the concentrator such that the collected light passes through the fly-eye lens. The light is homogenized by the fly-eye lens; a digital micro-mirror device is disposed opposite to the fly-eye lens; and a trans-internal total reflection 稜鏡 is disposed in front of the digital micro-mirror device in the same optical path to enable the light After the trans internal total reflection 稜鏡, the trans internal total reflection 投射 projects the ray onto the digital micromirror device, and is controlled by the digital micromirror device to cause the ray to re-enter the trans internal total reflection Oh, and through Lens onto a screen. The projection device of claim 7, wherein the fly-eye lens comprises: A plurality of lenslets that produce a plurality of images as the light passes through the lenslets. The projection device of claim 8, further comprising: a concave lens disposed opposite to the fly-eye lens, wherein the image is superimposed on the digital micromirror device by the concave lens; and an episode An optical device group is disposed opposite to the concave lens, the light concentrator set includes a first concentrator and a second concentrator, and the first concentrator and the second concentrator are configured to control the projection device The angular magnification. The projection device of claim 7, wherein the light emitting diode comprises: a red light emitting diode, a green light emitting diode, and a blue light emitting diode for generating a red light and a green color, respectively. Light and a blue light.